A self-styled democratic socialist whose calls for “Medicare for all,” a $15 minimum wage and tuition-free public colleges have become pillars of the party’s left wing, Mr. Sanders is among the best-known politicians to join an already crowded Democratic field and one of the most outspoken against President Trump, whom he has repeatedly called a “pathological liar” and a “racist.”

“Three years ago, during our 2016 campaign, when we brought forth our progressive agenda we were told that our ideas were ‘radical’ and ‘extreme,’” Mr. Sanders planned to say on Tuesday in an early-morning email to supporters, citing those health, economic and education policies as well as combating climate change and raising taxes on wealthy Americans.

“Well, three years have come and gone. And, as result of millions of Americans standing up and fighting back, all of these policies and more are now supported by a majority of Americans,” he said. (NYT)

"We're gonna win," Sanders told "CBS This Morning," vowing to "lay the groundwork for transforming the economic and political life of this country."

The RNC responded to the senator's announcement Tuesday, reminding people just how radically out-of-touch the policies he pushes are with mainstream voters.

"Bernie Sanders is a self-avowed socialist who wants to double your taxes so the government can take over your health care," said RNC Spokesman Michael Ahrens. "The vast majority of voters oppose his radical agenda, just like they are going to oppose all the 2020 Democrats who have rushed to embrace it."

This is a breaking news post and will be updated with additional information.